问题
                    
Dave lost his job and was short of money, so ______his flat and move in with his brother.
                            A:that he did was to sell
B:what he did sell
C:what he did was sell
D:what he did sold.
                        
                        B:what he did sell
C:what he did was sell
D:what he did sold.
正确答案是:
                         
                        
                        
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